If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation.

2x – 3y – z = –1
x – 4y + 3z = –11
2x + 9y + 3z = –13

a) –11y + 5z = 21
y + 9z = 9

b) 5y – 7z = 21
17y – 3z = 9

c) 7x – 13y = –14
8x + 0y = –16

d) –5x +5y = –8
–4x + 18z = –10

Question

If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation.

2x – 3y – z = –1
x – 4y + 3z = –11
2x + 9y + 3z = –13 

a) –11y + 5z = 21
y + 9z = 9 

b) 5y – 7z = 21
17y – 3z = 9 

c) 7x – 13y = –14
8x + 0y = –16 

d) –5x +5y = –8
–4x + 18z = –10

amistre64 · Answer

what does the isolated equation look like when solved for x?

amistre64 · Answer

c and d are out since they still retain an x ....so its gonna be a toss up between a and b i believe

anonymous · Answer

b is the answer 
multiply 2 to the second equation and subtract it from remaining equations

cwrw238 · Answer

i think its a but the first equation dont seem correct

amistre64 · Answer

it aint a, and i agree that its most likely b :)

amistre64 · Answer

2*4 = 8 - 3 = 5y

anonymous · Answer

Thank you yall!

cwrw238 · Answer

yea - its b

cwrw238 · Answer

yw